you shouldn't be taking carbs post-workout on a TKD! you would be defeating the purpose.
a good ordinary carb source for pre-workout on a TKD would be skim milk.....or something like gatorade or maltodextrin or sweet tarts, etc.
the goal is to take in as much carbs as you can, but be back in ketosis after your workout.....takes some practice to get it right.
if you take carbs post-workout, it is going to take you a lot longer to get back in ketosis.